Date:   Tue, 7 Feb 2023 10:15:32 -0800
From:   Saravana Kannan <saravanak@...gle.com>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Cristian Marussi <cristian.marussi@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Len Brown <lenb@...nel.org>,
        Rafał Miłecki <rafal@...ecki.pl>,
        Abel Vesa <abel.vesa@...aro.org>,
        Alexander Stein <alexander.stein@...tq-group.com>,
        Tony Lindgren <tony@...mide.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        John Stultz <jstultz@...gle.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Maxim Kiselev <bigunclemax@...il.com>,
        Maxim Kochetkov <fido_max@...ox.ru>,
        Luca Weiss <luca.weiss@...rphone.com>,
        Colin Foster <colin.foster@...advantage.com>,
        Martin Kepplinger <martin.kepplinger@...i.sm>,
        Jean-Philippe Brucker <jpb@...nel.org>,
        Vladimir Oltean <vladimir.oltean@....com>,
        kernel-team@...roid.com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH v3 00/12] fw_devlink improvements

On Tue, Feb 7, 2023 at 7:28 AM Doug Anderson <dianders@...omium.org> wrote:
>
> Hi,
>
> On Mon, Feb 6, 2023 at 5:42 PM Saravana Kannan <saravanak@...gle.com> wrote:
> >
> > Naresh, Tony, Abel, Geert, Dmitry, Maxim(s), Miquel, Luca, Doug, Martin,
> > Jean-Philippe,
> >
> > Can I get your Tested-by's for this v3 series please?
> >
> > Vladimir,
> >
> > Ccing you because DSA's and fw_devlink have known/existing problems
> > (still in my TODOs to fix). But I want to make sure this series doesn't
> > cause additional problems for DSA.
> >
> > All,
> >
> > This patch series improves fw_devlink in the following ways:
> >
> > 1. It no longer cares about a fwnode having a "compatible" property. It
> >    figures this out more dynamically. The only expectation is that
> >    fwnodes that are converted to devices actually get probed by a driver
> >    for the dependencies to be enforced correctly.
> >
> > 2. Finer grained dependency tracking. fw_devlink will now create device
> >    links from the consumer to the actual resource's device (if it has one,
> >    Eg: gpio_device) instead of the parent supplier device. This improves
> >    things like async suspend/resume ordering, potentially remove the need
> >    for frameworks to create device links, more parallelized async probing,
> >    and better sync_state() tracking.
> >
> > 3. Handle hardware/software quirks where a child firmware node gets
> >    populated as a device before its parent firmware node AND actually
> >    supplies a non-optional resource to the parent firmware node's
> >    device.
> >
> > 4. Way more robust at cycle handling (see patch for the insane cases).
> >
> > 5. Stops depending on OF_POPULATED to figure out some corner cases.
> >
> > 6. Simplifies the work that needs to be done by the firmware specific
> >    code.
> >
> > The v3 series has gone through my usual testing on my end and looks good
> > to me.
> >
> > Thanks,
> > Saravana
> >
> > [1] - https://lore.kernel.org/lkml/20220810060040.321697-1-saravanak@google.com/
> > [2] - https://lore.kernel.org/lkml/CAGETcx-JUV1nj8wBJrTPfyvM7=Mre5j_vkVmZojeiumUGG6QZQ@mail.gmail.com/
> >
> > v1 -> v2:
> > - Fixed Patch 1 to handle a corner case discussed in [2].
> > - New patch 10 to handle "fsl,imx8mq-gpc" being initialized by 2 drivers.
> > - New patch 11 to add fw_devlink support for SCMI devices.
> >
> > v2 -> v3:
> > - Addressed most of Andy's comments in v2
> > - Added Colin and Sudeep's Tested-by for the series (except the imx and
> >   renesas patches)
> > - Added Sudeep's Acked-by for the scmi patch.
> > - Added Geert's Reviewed-by for the renesas patch.
> > - Fixed gpiolib crash reported by Naresh.
> > - Patch 6: Fix __fwnode_links_move_consumers() to preserve fwnode link flags.
> > - New Patch 12 to fix nvmem-cells issue reported by Maxim(s)/Miquel.
> > - Deleted some stale function doc in Patch 8
> >
> > Cc: Abel Vesa <abel.vesa@...aro.org>
> > Cc: Alexander Stein <alexander.stein@...tq-group.com>
> > Cc: Tony Lindgren <tony@...mide.com>
> > Cc: Sudeep Holla <sudeep.holla@....com>
> > Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
> > Cc: John Stultz <jstultz@...gle.com>
> > Cc: Doug Anderson <dianders@...omium.org>
> > Cc: Guenter Roeck <linux@...ck-us.net>
> > Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> > Cc: Maxim Kiselev <bigunclemax@...il.com>
> > Cc: Maxim Kochetkov <fido_max@...ox.ru>
> > Cc: Miquel Raynal <miquel.raynal@...tlin.com>
> > Cc: Luca Weiss <luca.weiss@...rphone.com>
> > Cc: Colin Foster <colin.foster@...advantage.com>
> > Cc: Martin Kepplinger <martin.kepplinger@...i.sm>
> > Cc: Jean-Philippe Brucker <jpb@...nel.org>
> > Cc: Vladimir Oltean <vladimir.oltean@....com>
> >
> > Saravana Kannan (12):
> >   driver core: fw_devlink: Don't purge child fwnode's consumer links
> >   driver core: fw_devlink: Improve check for fwnode with no
> >     device/driver
> >   soc: renesas: Move away from using OF_POPULATED for fw_devlink
> >   gpiolib: Clear the gpio_device's fwnode initialized flag before adding
> >   driver core: fw_devlink: Add DL_FLAG_CYCLE support to device links
> >   driver core: fw_devlink: Allow marking a fwnode link as being part of
> >     a cycle
> >   driver core: fw_devlink: Consolidate device link flag computation
> >   driver core: fw_devlink: Make cycle detection more robust
> >   of: property: Simplify of_link_to_phandle()
> >   irqchip/irq-imx-gpcv2: Mark fwnode device as not initialized
> >   firmware: arm_scmi: Set fwnode for the scmi_device
> >   mtd: mtdpart: Don't create platform device that'll never probe
>
> I tested the whole series together on several devices. I tried to test
> on a wide variety since previous versions had broken due to all the
> dependency cycles in the display and some of these devices used
> different components in their display pipeline. I didn't do massive
> testing but did confirm that basic devices came up, including display.
>
> Devices tested with your v3 applied atop v6.2-rc7-11-g05ecb680708a:
>
> * sc7180-trogdor-lazor (with ps8640 bridge), which had failed to bring
> up the display on v2.
>
> * sc7180-trogdor-lazor (with sn65dsi86 bridge)
>
> * sc7180-trogdor-pazquel (with sn65dsi86 bridge)
>
> * sc7180-trogdor-homestar (with ps8640 bridge)
>
> * sc7180-trogdor-wormdingler
>
> * sc7280-herobrine-villager
>
> Tested-by: Douglas Anderson <dianders@...omium.org>

Thanks a lot for all this testing and helping me debug the ps8640 issue Doug!

-Saravana

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